Meanwhile, some researchers have hinted, and others have claimed, that the attacks against both Google and Adobe were based on malicious PDFs that exploited a just-patched vulnerability in Adobe's popular Reader software.
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Adobe is the first company to step forward after Google announced that the attacks were aimed at accessing Gmail accounts of human rights activists .
"We are still in the process of conducting our investigation into the incident," said Wiebke Lips, Adobe's senior manager of corporate communications, in an e-mail reply to questions today. "[But] It appears that this incident and the one Google announced earlier are related."
Google and Adobe acknowledged that their company systems had been struck by what both firms characterized as "sophisticated" attacks. Google added that it believed the attacks against its network, which took place last month, originated in China.
Google claimed that some of its intellectual property was stolen in the attack, and added that another aim of the assault was to access the Gmail accounts of Chinese human-rights activists. The California-based search firm cited the latter, as well as ever-more-restrictive rules ordered by the Chinese government, in its decision to review its business in the country.
If the Chinese do not allow Google to run its Chinese search engine unfiltered, the company may pull out of the lucrative market.
Adobe also admitted that it had been targeted by attackers. "Adobe became aware on January 2, 2010 of a computer security incident involving a sophisticated, coordinated attack against corporate network systems managed by Adobe and other companies," the company said in a Tuesday statement posted on its company blog . "At this time, we have no evidence to indicate that any sensitive information -- including customer, financial, employee or any other sensitive data -- has been compromised."
Security researchers hinted earlier today that the attacks against Google, Adobe and dozens of other major firms were conducted using malicious PDFs that exploited one or more vulnerabilities in Adobe Reader. Analysts at Verisign's iDefense security group told Robert McMillan of IDGNews today that hackers had launched targeted attacks using a malicious document attached to e-mail messages.